JVC
Acknowledgement Response Return Codes - Advanced
For some functions, it is possible to obtain a more detailed response from the projector. This is useful where different actions are required depending on the current projector settings or status. To request the detailed response, taking the above example of the Power Command, send to the projector:
3F 89 01 50 57 0A
If the projector receives the enquiry command, as a confirmation that it has received the command, it will first respond with exactly the same information as that returned by the basic Acknowledgement Return Code shown on page 11:
06 89 01 50 57 0A
Next, the projector will send the detailed response. It will send:
40 89 01 50 57 RR 0A – Where RR is the Detailed Response Return Code.
For clarity, the two returned responses are separated here. In practice, they are returned from the projector as one continuous string.
For the Power Status Enquiry, the possible values for the Detailed Response Return Code status (RR) are:
30 – Standby
31 – Power On
32 – Cooling
34 – Emergency
So, as a full worked example, if we send to the projector:
3F 89 01 50 57 0A
If the projector were currently cooling down after being switched to Standby, it would return:
06 89 01 50 57 0A 40 89 01 50 57 32 0A
If the projector were on Standby, it would return:
06 89 01 50 57 0A 40 89 01 50 57 30 0A
A list of all of the useful enquiry codes, together with all possible detailed responses is below:
Power Status (to confirm the current Power Status)
Enquiry Command (to projector) | 3F 89 01 50 57 0A |
|
Response (from projector) | 06 89 01 50 57 0A 40 89 01 50 57 RR 0A |
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Response (RR) | Meaning |
|
30 | Standby | |
31 | Power On | |
32 | Cooling | |
34 | Emergency | |
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